I am having problems with measuring the amount of water that goes through my V60.

I have a Jennings CJ-4000, on top of which I put a warm carafe, the V60, a washed filter, and 24 g of ground coffee. My goal is to get 390 g (or mL) of water going through in about 2.5 min. I then zero the scales and start pouring, slowly and in stages. The problem is that, after a couple of minutes, the readout on the scales actually starts decreasing quite significantly, even though I am still pouring water into the grounds. This makes it impossible to know how much water I am actually pouring over, and by the end I feel like I could be out by as much as 50-100 mL.

Has anybody seen this before? Does anybody know what's going on? Thanks.

I am having problems with measuring the amount of water that goes through my V60.

I have a Jennings CJ-4000, on top of which I put a warm carafe, the V60, a washed filter, and 24 g of ground coffee. My goal is to get 390 g (or mL) of water going through in about 2.5 min. I then zero the scales and start pouring, slowly and in stages. The problem is that, after a couple of minutes, the readout on the scales actually starts decreasing quite significantly, even though I am still pouring water into the grounds. This makes it impossible to know how much water I am actually pouring over, and by the end I feel like I could be out by as much as 50-100 mL.

Has anybody seen this before? Does anybody know what's going on? Thanks.

I would also suggest testing your scale for heat sensitivity. Place your carafe full of hot water on the scale with something between the scale and the carafe to insulate the scale from the heat and make a measurement. Remove the heat insulator and place the carafe back on the scale with the insulator on top of the carafe this time and watch the scale to see if it weighs the same and if the weight changes as the scale heats up.

I picked up some cork coasters to see if this was happening with my American Weigh scales, but it did not appear to be an issue in my case.

I tried it today with a book underneath the carafe and I saw no drift in the weight measurement. I'll need to start looking for a more convenient way to insulate the carafe from the plate on the scales, however.

I'm a little surprised that I never saw any mention of this before (I did a lot of reading around before I decided on a set of scales). Is there a better sort of carafe to use to collect the coffee, i.e., one that's more insulated on its bottom? At the moment I'm using a stainless steel milk pitcher.

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